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What could cause the errors: "Invalid Read Reply" and "Specified Address Invalid" on the Magelis when communicating to the Siemens S7-1200 ethernet driver?

Issue:
What could cause the errors:  "Invalid Read Reply" and "Specified Address Invalid" on the Magelis when communicating to the Siemens S7-1200 ethernet driver?

Product Line:
S7-1211C, S7-1212C, S7-1214C, S7-1215C, S7 ethernet

Environment:


Cause:


Resolution:
Protection
From TIA (Siemens programming software), Select the CPU project in the left pane and press Alt-Enter (or in the contextual menu select “Properties…”)
In the item Protection, select “Full access” and Check “Permit access with PUT/GET communications from remote partner” as in figure below.




Information was taken from:  http://snap7.sourceforge.net/snap7_client.html 2-25-2016
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